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-rw-r--r--src/openvg/qpaintengine_vg.cpp41
1 files changed, 22 insertions, 19 deletions
diff --git a/src/openvg/qpaintengine_vg.cpp b/src/openvg/qpaintengine_vg.cpp
index b3b923d..d1e899a 100644
--- a/src/openvg/qpaintengine_vg.cpp
+++ b/src/openvg/qpaintengine_vg.cpp
@@ -182,6 +182,7 @@ public:
qreal penScale; // Pen scaling factor from "transform".
QTransform pathTransform; // Calculated VG path transformation.
+ QTransform glyphTransform; // Calculated VG glyph transformation.
QTransform imageTransform; // Calculated VG image transformation.
bool pathTransformSet; // True if path transform set in the VG context.
@@ -499,24 +500,31 @@ extern bool qt_scaleForTransform(const QTransform &transform, qreal *scale);
void QVGPaintEnginePrivate::updateTransform(QPaintDevice *pdev)
{
- VGfloat devh = pdev->height() - 1;
+ VGfloat devh = pdev->height();
// Construct the VG transform by combining the Qt transform with
// the following viewport transformation:
- // | 1 0 0 | | 1 0 0.5 | | 1 0 0.5 |
- // | 0 -1 devh | * | 0 1 -0.5 | = | 0 -1 (0.5 + devh) |
- // | 0 0 1 | | 0 0 1 | | 0 0 1 |
+ // | 1 0 0 |
+ // | 0 -1 devh |
+ // | 0 0 1 |
+ // The glyph transform uses a slightly different transformation:
+ // | 1 0 0 | | 1 0 0.5 | | 1 0 0.5 |
+ // | 0 -1 devh - 1 | * | 0 1 -0.5 | = | 0 -1 (devh - 0.5) |
+ // | 0 0 1 | | 0 0 1 | | 0 0 1 |
// The full VG transform is effectively:
// 1. Apply the user's transformation matrix.
- // 2. Translate by (0.5, -0.5) to correct for Qt and VG putting
- // the centre of the pixel at different positions.
+ // 2. Translate glyphs by an extra (0.5, -0.5).
// 3. Flip the co-ordinate system upside down.
QTransform viewport(1.0f, 0.0f, 0.0f,
0.0f, -1.0f, 0.0f,
- 0.5f, devh + 0.5f, 1.0f);
+ 0.0f, devh, 1.0f);
+ QTransform gviewport(1.0f, 0.0f, 0.0f,
+ 0.0f, -1.0f, 0.0f,
+ 0.5f, devh - 0.5f, 1.0f);
// Compute the path transform and determine if it is projective.
pathTransform = transform * viewport;
+ glyphTransform = transform * gviewport;
bool projective = (pathTransform.m13() != 0.0f ||
pathTransform.m23() != 0.0f ||
pathTransform.m33() != 1.0f);
@@ -525,6 +533,7 @@ void QVGPaintEnginePrivate::updateTransform(QPaintDevice *pdev)
// so we will have to convert the co-ordinates ourselves.
// Change the matrix to just the viewport transformation.
pathTransform = viewport;
+ glyphTransform = gviewport;
simpleTransform = false;
} else {
simpleTransform = true;
@@ -532,13 +541,7 @@ void QVGPaintEnginePrivate::updateTransform(QPaintDevice *pdev)
pathTransformSet = false;
// The image transform is always the full transformation,
- // because it can be projective. It also does not need the
- // (0.5, -0.5) translation because vgDrawImage() implicitly
- // adds 0.5 to each co-ordinate.
- QTransform viewport2(1.0f, 0.0f, 0.0f,
- 0.0f, -1.0f, 0.0f,
- 0.0f, devh + 1, 1.0f);
- imageTransform = transform * viewport2;
+ imageTransform = transform * viewport;
// Calculate the scaling factor to use for turning cosmetic pens
// into ordinary non-cosmetic pens.
@@ -3331,7 +3334,7 @@ void QVGPaintEngine::drawStaticTextItem(QStaticTextItem *textItem)
}
// Set the transformation to use for drawing the current glyphs.
- QTransform glyphTransform(d->pathTransform);
+ QTransform glyphTransform(d->glyphTransform);
glyphTransform.translate(p.x(), p.y());
#if defined(QVG_NO_IMAGE_GLYPHS)
glyphTransform.scale(glyphCache->scaleX, glyphCache->scaleY);
@@ -3669,10 +3672,10 @@ void QVGCompositionHelper::fillBackground
} else {
// Set the path transform to the default viewport transformation.
- VGfloat devh = screenSize.height() - 1;
+ VGfloat devh = screenSize.height();
QTransform viewport(1.0f, 0.0f, 0.0f,
0.0f, -1.0f, 0.0f,
- -0.5f, devh + 0.5f, 1.0f);
+ 0.0f, devh, 1.0f);
d->setTransform(VG_MATRIX_PATH_USER_TO_SURFACE, viewport);
// Set the brush to use to fill the background.
@@ -3708,10 +3711,10 @@ void QVGCompositionHelper::drawCursorPixmap
}
// Set the image transformation and modes.
- VGfloat devh = screenSize.height() - 1;
+ VGfloat devh = screenSize.height();
QTransform transform(1.0f, 0.0f, 0.0f,
0.0f, -1.0f, 0.0f,
- -0.5f, devh + 0.5f, 1.0f);
+ 0.0f, devh, 1.0f);
transform.translate(offset.x(), offset.y());
d->setTransform(VG_MATRIX_IMAGE_USER_TO_SURFACE, transform);
d->setImageMode(VG_DRAW_IMAGE_NORMAL);